<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表区域 -->
      <el-table :data="rolesList" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightsById(scope.row, item1.id)">{{ item1.authName }}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过 for 循环嵌套渲染二级权限 -->
                <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                  <!-- 二级权限 -->
                  <el-col :span="6">
                    <el-tag type="success" closable @close="removeRightsById(scope.row, item2.id)">{{ item2.authName }}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <!-- 三级权限 -->
                  <el-col :span="18">
                    <el-tag type="warning" v-for="item3 in item2.children" :key="item3.id" closable @close="removeRightsById(scope.row, item3.id)">{{ item3.authName }}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300">
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
            <el-button type="warning" icon="el-icon-setting" size="mini" @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisiable"
      @close="setRightDialogClosed"
      width="50%">
      <!-- 内容主体区域 -->
      <span>
        <!-- 树形控件 -->
        <el-tree :data="rightsList" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
      </span>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisiable = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 角色列表
      rolesList: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisiable: false,
      // 所有权限的数据
      rightsList: [],
      // 属性控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点的id值数组
      defKeys: [],
      // 当前即将分配权限的角色id（在打开树形组件分配权限的时候使用）
      roleId: ''
    }
  },

  created() {
    // 获取所有角色
    this.getRolesList()
  },

  methods: {
    // 获取角色列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) return this.$message.error('获取角色列表失败！')
      this.rolesList = res.data
    },

    // 根据id删除对应的权限
    async removeRightsById(role, rightId) {
      // 确认弹框
      const confirmRes = await this.$confirm('此操作将永久删除该权限，是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmRes !== 'confirm') return this.$message.info('取消了删除!')
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) return this.$message.error('删除权限失败')
      role.children = res.data
    },

    // 展示分配权限的对话框
    async showSetRightDialog(role) {
      // 当前即将分配权限的角色id（在打开树形组件分配权限的时候使用）
      this.roleId = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) return this.$message.error('获取权限列表失败')
      this.rightsList = res.data
      // 获取三级节点的id
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisiable = true
    },

    // 获取角色拥有的所有三级权限的 id, 并保存到defKeys中
    getLeafKeys(node, arr) {
      // r如果当前节点不包含 node 属性，则是三级节点
      if (!node.children) return arr.push(node.id)

      node.children.forEach(item => {
        this.getLeafKeys(item, arr)
      })
    },

    // 监听分配权限的对话框的关闭事件
    setRightDialogClosed() {
      this.defKeys = []
    },

    // 点击确定按钮为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { idStr: idStr })
      if (res.meta.status !== 200) return this.$message.error('分配权限失败')
      this.$message('分配权限成功')
      this.getRolesList()
      this.setRightDialogVisiable = false
    }
  }
}
</script>

<style lang="less" scoped>
  .el-tag {
    margin: 7px;
  }

  // 为展开的权限添加上边框
  .bdtop {
    border-top: 1px solid #eee;
  }

  // 为展开的权限添加下边框
  .bdbottom {
    border-bottom: 1px solid #eee;
  }

  // 让权限内容上下居中
  .vcenter {
    display: flex;
    align-items: center;
  }
</style>
